When I was serving the military number plates were; two numbers, two letters, two numbers, combo i.e. 12 GB 12. Now they are; two letters, two numbers, two letters, combo i.e. GB 12 GB. Please can anybody advise me in which year they changed to the new system and was the new numbering system brought in on all class of vehicle at the same time. Many thanks. PS; A free Puka pie to the first ex trogg who can confirm the vehicle which carried 12 GB 12 number plates.